>>508222824It was a proper AA installation not a MANPADs.
The Nighthawk has a critical flaw in that it has to open its bay doors to drop ordinance, and when the bay doors are open they return a radar cross section equivalent to a normal aircraft, which provides a fireable track for FCS radars. A serbian AA system got lucky and flipped on their radar just when an undetected Nighthawk dropped its payload and got the one in a million shot. It remains the only loss of a stealth plane in history, so I suppose that is their distinguished honor.
Fun fact: stealth is designed to safeguard planes from long range detection and early warning radars, not fire control radars. The traditional approach is to support a stealth strike with a wing of SEAD planes armed with anti-radiation missiles, to keep surface AA from being able to use their fire control radars. It's just a happy accident that stealth technology also makes fire control radars less effective. All post-nighthawk stealth designs solved the bay door vulnerability, but the nighthawk itself was only ever meant to be a prototype for future stealth planes, it only stayed in service as long as it did because the efficacy of stealth shocked everyone.